Research Geologist
Geology, Geophysics, and Geochemistry Science Center
Email:
rtaylor@usgs.gov
Office Phone:
303-236-1882
Fax:
303-236-3200
ORCID:
0000-0002-8845-5290
Supervisor:
Garth E Graham
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This data release is part of a 2016-2019 study on the geology, geochemistry and geochronology of ore systems in the eastern Yukon-Tanana Upland region, Alaska. Whole rock chemistry was conducted on 185 samples, mostly from Au prospects, with lesser samples from porphyry Cu prospects. Geographically, most samples are from gold prospects near the Pogo Au mine and east to Black Mountain in the Big Delta quadrangle. Fewer samples are from prospects in the Eagle and Tanacross Quadrangles. Samples were submitted to the USGS contract laboratory and analyzed for select trace elements and gold. Sixty elements were determined by inductively coupled plasma-optical emission spectroscopy-mass spectroscopy (ICP-OES-MS), sodium...
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Alaska,
Big Delta,
Black Mountain,
Eagle,
Economic Geology, All tags...
GGGSC,
Geochemistry,
Geology, Geophysics and Geochemistry Science Center,
ICP-MS,
MRP,
Mineral Resources,
Mineral Resources Program,
Mount Hayes,
NCCWSC,
Tanacross,
U.S. Geological Survey,
USGS,
USGS Science Data Catalog (SDC),
Yukon-Tanana Upland,
chemical analysis,
economic geology,
geochemistry,
geoscientificInformation,
inductively coupled plasma mass spectrometry,
metallic mineral resources,
mineral deposits,
mineral resources, Fewer tags
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Thirty-four ore, twenty-nine mine waste, seven host rock, two pegmatite, and one slag sample were collected from iron oxide-apatite (IOA) mines in the eastern Adirondack Highlands near Mineville and Ticonderoga, New York, from March 2016 to August 2018. The waste pile samples included twenty-five samples collected from rubble-sized mine waste piles and four samples from processed tailings piles. The ore from historic iron mines of the eastern Adirondack Highlands, New York, contain abundant quantities of rare earth element (REE)-bearing apatite crystals. These apatite crystals are especially enriched in Y, La, Ce, and Nd. In-ground ore, mine waste piles, and tailings piles could contain apatite...
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Adirondack Mountains,
Energy Resources,
Geochemistry,
ICP-MS,
ICP-OES, All tags...
Mineville,
New York,
Ticonderoga,
USGS Science Data Catalog (SDC),
WDXRF,
apatite,
geochemistry,
iron,
mine tailings,
mine waste,
mineral resources,
rare earth elements,
tailing piles, Fewer tags
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In situ geochemical data were obtained for pyrite crystals and native gold from two distinct vein sets in the Grass Valley gold district, California. Samples of the N-S veins were collected underground at the Empire Mine State Historic Park and samples of the E-W veins were collected from drill core provided by the Idaho-Maryland Mining Corporation in 2008. These geochemical data were analyzed to better understand paragenesis of quartz veins in orogenic gold deposits. Data includes electron probe microanalysis (EPMA) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) chemistry and LA-ICP-MS sulfur isotope values for pyrite crystals, and EPMA geochemistry of native gold grains found within...
Categories: Data;
Tags: California,
EPMA,
Geochemistry,
Grass Valley,
LA-ICP-MS, All tags...
Mineralogy,
USGS Science Data Catalog (SDC),
chemical analysis,
electron probe microanalysis,
geochemistry,
geoscientificInformation,
gold,
mineralogy,
rock,
rock geochemistry, Fewer tags
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The iron oxide-apatite (IOA) deposits near Mineville in the Adirondack Mountains, New York, have been of interest for their rich magnetite ore since the mid-1700s but have attracted renewed attention due to their potential as rare earth element (REE) resources (McKeown and Klemic, 1956; Lupulescu and others, 2016; Taylor and others, 2018). Apatite is the main REE-host and is found in variable concentrations within ore seams of the regional magnetite deposits. Some apatite crystals are unaltered, relatively homogenous, and inclusion-free, whereas other deposits contain heterogenous apatite with zones of abundant secondary mineral inclusions that were formed through metasomatic reactions with the apatite after initial...
Categories: Data;
Tags: Adirondack Mountains,
Geochemistry,
Mineralogy,
Mineville,
New York, All tags...
Ticonderoga,
Town of Moriah,
USGS Science Data Catalog (SDC),
apatite,
economic geology,
economy,
electron microprobe,
geochemistry,
geoscientificInformation,
mineralogy,
particle-beam spectroscopy,
rare earth elements, Fewer tags
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This data release presents the major and trace element chemistry of rock samples collected by the U.S. Geological Survey (USGS) from surface exposures of the Dora Bay igneous complex (DBIC), located in the southern part of Prince of Wales Island, southeastern Alaska. The DBIC is Early Jurassic in age (Bala and others, 2014) and is U-Th-heavy rare earth element (HREE)-enriched like the Bokan Mountain intrusive complex 30 km to the south (Philpotts and others 1998; Dostal and others, 2011; Taylor and others, 2016; 2017). However, the DBIC is significantly less-well-mineralized and is under-explored due to complicated private land status issues. HREE-enriched eudialyte-bearing pegmatites and felsic dikes have been...
Categories: Data;
Tags: Alaska,
Alexander terrane,
Dora Bay,
Economic Geology,
Exploration, All tags...
Fluorite,
Geochemical surveys,
Geochemistry,
Geochemistry,
ICP-MS,
ICP-OES,
Igneous rocks,
Jurassic,
MRP,
Mesozoic,
Mineral Resources,
Mineral Resources Program,
Mineral deposits,
Mineral resources,
Molybdenite,
Prince of Wales Island,
Prospecting,
Rare Earth Elements,
Southeast Alaska,
Thorium,
USA,
USGS,
USGS Science Data Catalog (SDC),
United States Geological Survey,
United States of America,
Uranium,
WDXRF,
inductively coupled plasma-mass spectrometry,
inductively coupled plasma-optical emission spectrometry,
wavelength dispersive X-ray fluorescence spectrometry, Fewer tags
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